<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #div1 {
            background: red;
            float: left;
            height: 100px;
            width: 100px;
        }
        #div2{
            border-style: solid;
            border-width: 1px;
            overflow: hidden;
        }
        
    </style>
</head>

<body>
    <div id="div2">
        <div id="div1" ></div>
    </div>

</body>

</html>